Mybatis使用手册

一、Mybatis环境搭建

1.数据库的准备

(1) 数据库SQL脚本

DROP TABLE IF EXISTS `employee_basic`;
CREATE TABLE `employee_basic`  (
  `emp_no` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '员工号',
  `emp_name` varchar(12) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '',
  `dept_id` varchar(3) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' COMMENT '所在的部门号（外键），指向部门信息表的dept_id',
  `emp_gender` varchar(6) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `emp_email` varchar(28) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `emp_nation` varchar(16) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '民族',
  `emp_marriage` varchar(6) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `emp_health` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `emp_zzmm` varchar(8) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '政治面貌',
  `emp_blood` varchar(6) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '血型',
  `emp_state` varchar(10) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '员工状态',
  PRIMARY KEY USING BTREE (`emp_no`)
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

INSERT INTO `employee_basic` VALUES ('HW9801', '张丹枫', '101', '男', '[email protected]', '汉族', '已婚', '良好', '党员', 'O型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9802', '史密斯', '101', '男', '[email protected]', '满族', '已婚', '良好', '群众', 'A型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9803', '余小男', '101', '女', '[email protected]', '汉族', '未婚', '良好', '群众', 'B型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9804', '李莉莉', '102', '女', '[email protected]', '回族', '未婚', '良好', '团员', 'B型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9805', 'Marry', '102', '女', '[email protected]', '汉族', '未婚', '良好', '群众', 'O型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9806', '郭靖', '103', '男', '[email protected]', '汉族', '已婚', '良好', '党员', 'O型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9807', '王强', '103', '男', '[email protected]', '汉族', '已婚', '良好', '党员', 'O型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9808', '李娜', '103', '女', '[email protected]', '汉族', '未婚', '良好', '群众', 'O型', '在职');
INSERT INTO `employee_basic` VALUES ('HW9809', '许天仪', '103', '男', '[email protected]', '汉', '已婚', '一般', '党员', 'O型', '退休');

2.导入依赖坐标

<dependencies>
     <!-- mybatis核心包-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.5</version>
    </dependency>
    <!--mysql驱动包-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>
    <!--单元测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.10</version>
        <scope>test</scope>
    </dependency>
    <!--日志-->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
</dependencies>

3.log4j.properties内容

log4j.rootCategory=DEBUG,CONSOLE,LOGFILE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%C %d{YYYY-MM-dd hh:mm:ss} %L %m %n
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=h://zhang.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%C %m %n  %L

4.Pojo层实体类

package com.zxf.pojo;

import java.io.Serializable;

public class Employee implements Serializable {
    private String emp_no;
    private String emp_name;
    private String emp_email;
    private String emp_nation;
    private String emp_zzmm;
    private String emp_blood;
    private String emp_state;

    public String getEmp_no() {
        return emp_no;
    }

    public void setEmp_no(String emp_no) {
        this.emp_no = emp_no;
    }

    public String getEmp_name() {
        return emp_name;
    }

    public void setEmp_name(String emp_name) {
        this.emp_name = emp_name;
    }

    public String getEmp_email() {
        return emp_email;
    }

    public void setEmp_email(String emp_email) {
        this.emp_email = emp_email;
    }

    public String getEmp_nation() {
        return emp_nation;
    }

    public void setEmp_nation(String emp_nation) {
        this.emp_nation = emp_nation;
    }

    public String getEmp_zzmm() {
        return emp_zzmm;
    }

    public void setEmp_zzmm(String emp_zzmm) {
        this.emp_zzmm = emp_zzmm;
    }

    public String getEmp_blood() {
        return emp_blood;
    }

    public void setEmp_blood(String emp_blood) {
        this.emp_blood = emp_blood;
    }

    public String getEmp_state() {
        return emp_state;
    }

    public void setEmp_state(String emp_state) {
        this.emp_state = emp_state;
    }
}

5.Mapper接口

package com.zxf.mapper;
import com.zxf.pojo.Employee;
import java.util.List;
/*
     映射接口  employee
 */
public interface EmployeeMapper {
    //查询所有
    public List<Employee>findAll();
}

6.Mapper接口的映射配置文件xml

在resources创建了一个文件夹，后期所有的配置接口映射文件都放在这

EmployeeMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--
namespace   mapper接口的全路径
 -->
<mapper namespace="com.zxf.mapper.EmployeeMapper">
    <!--
        id属性 接口中方法名字一致
         resultType属性 包名+类名
    -->
    <select id="findAll" resultType="com.zxf.pojo.Employee">
        SELECT * from employee_basic
    </select>
</mapper>

7.编写mybatis的核心配置文件

mybatisConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--环境配置-->
    <environments default="mysql_1">
        <environment id="mysql_1">
             <!-- 事务类型-->
       <transactionManager type="JDBC"></transactionManager>
            <!--是否使用连接池，内置的连接池 -->
            <dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://192.168.0.148:3306/test"/>
                <property name="username" value="root"/>
                <property name="password" value="abc"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 引入映射-->
    <mappers>
        <mapper resource="mappers/EmployeeMapper.xml"/>
    </mappers>
</configuration>

8.编写一个Junit测试类

package com.zxf.test;
import com.zxf.mapper.EmployeeMapper;
import com.zxf.pojo.Employee;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class Test1 {
    //通过调用配置文件的<select id="findAll" 来查询数据库
    @Test
    public void test1()throws IOException{
         //加载主配置文件
        InputStream is= Resources.getResourceAsStream("mybatisConfig.xml");
        //创建SqlSessionFactory对象
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        //通过工厂获取SqlSession
        SqlSession session=factory.openSession();
        List<Employee> findAll = session.selectList("findAll");
        for(Employee e:findAll){
            System.out.print(e.getEmp_no()+" ");
            System.out.print(e.getEmp_name()+" ");
            System.out.print(e.getEmp_email()+" ");
            System.out.print(e.getEmp_blood()+" ");
            System.out.print(e.getEmp_zzmm()+" ");
            System.out.print(e.getEmp_nation()+" ");
            System.out.println(e.getEmp_state());
        }
    }
    //通过调用Mapper接口的方法findAll 来查询数据库
    @Test
    public void test2()throws IOException{
        //加载主配置文件
        InputStream is= Resources.getResourceAsStream("mybatisConfig.xml");
        //创建SqlSessionFactory对象
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        //通过工厂获取SqlSession
        SqlSession session=factory.openSession();
        EmployeeMapper employeeMapper=session.getMapper(EmployeeMapper.class);
         List<Employee> findAll_2 = employeeMapper.findAll();
        for(Employee e:findAll_2){
            System.out.print(e.getEmp_no()+" ");
            System.out.print(e.getEmp_name()+" ");
            System.out.print(e.getEmp_email()+" ");
            System.out.print(e.getEmp_blood()+" ");
            System.out.print(e.getEmp_zzmm()+" ");
            System.out.print(e.getEmp_nation()+" ");
            System.out.println(e.getEmp_state());
        }
        session.close();
        is.close();
    }
}

9.项目结构架构层次

10.运行结果

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